Bonjour pouvez vous m’aidez pour cette exercice svp merci

bonjour
2 x + 4 = 0
2 x = - 4
x = - 2
4 x = 16
x = 4
4 x - 2 = 6
4 x = 6 + 2
4 x = 8
x = 2
2 x - 6 = 0
2 x = 6
x = 3
2 x + 4 + 8 + 2 x = x - 2
4 x - x = - 2 - 12
3 x = - 14
x = - 14/3
12 - 3 x - 2 x +2 = 3 x - 6
- 5 x - 3 x = - 6 - 12 - 2
- 8 x = - 20
x = 20/8 = 5/2
2 x + 5 > 7
2 x > 7 - 5
2 x > 2
x > 1
x + 4 ≤ 2 x - 1
x - 2 x ≤ - 1 - 4
- x ≤ - 5
x ≥ 5